Best available corn



BEST AVAILABLE COP Mar; 20, 1923.

L. TAGLIAFERRI.

ELECTRIC FURNACE.

FILED MM?.25. 1920.

' Irv van/om .ZowQ 22 L64 BEST AVAiLABLE COP:

L. TAGLIAF ERR I.

ELECTRIC FURNACE.

Mar. 20, 1923.

A SHEET\S-SHEE:T 2

FILED MAR. 25.1920.

. BEST AVAILABLE COP;

Mar. 20, 1923. 7

L. TAGLIAFERRI. ELECTRIC FURNACE.

man MAR. 25. 1920.

j r/venzllf:

Zeone e 1 LAM BEST AVAILABLE COP Mar. 20, 1923. 1,449,307.

L. TAGLIAFERRI.

ELECTRIC FURNACE. 4 FILED MAR.25.1920. 4 EEEEEEEEEEEE 4.

Patented Mar. 20, 1923.

UNITED stares BEST AVAILABLE COP LEONE TAGLIAIEEBRI, OF.GE1\TOA, ITALY. f

ELECTRIC Application fil ed March 25,

To all whomz't may concern.

, Be it known that I, L onn TAGLIAFERRI', a subject of the Kingpf Italy,and.,re sident of- Genoa, Italy, have invented certain new and useful Improvements in Electric Furnaces, ofwhich the following is a specification.

. The-presentinvention relatesto improvements in electric furnacesv and morefparticularly to the mea'nsffor supplying and distributing the .electric current to the electric furnaces for melting steel,- brass, bronze copper, and aluminum alloys. f .The purpose of;- he inventionis togattain a better distribution of the heat upon the surface-0f the bath, cuttingout of. operation the bottom of the furnace, and if necessary, also the bath itself. I i

, A further purpose is to obtain a better regulation and control of the temperature, and as a consequence, of the melting ,operation, by means of a certainnuinber', of arcs, and moreover to eliminatei'excessive variations of the load during the starting.

According to the invention, because of the special arrangement of the supplying electric circuits, the furnace may be grounded, thus attaining a greater safety for the operators.

For a better understanding of the present invention, the same is described with reference to the accompanying drawings, in which are represented the several steps and circuits diagrams for furnaces supplied with two phase or three phase electric circuits.

In the drawings:

Fig. 1 shows the first step in the working of a furnace supplied with three phase current. in which the body of the furnace constitutes the neutral and in which the arc is formed between the electrodes, that is, between the phases and the neutral.

Fig. 2 shows the second step, that is, the melting having been obtained, the additional electrodes are taken apart, the are being directly formed between the phase and the bath which is the neutral.

Fig. 3 shows the same type of furnace in which the electrodes are connected independently in pairs (one horizontal and the other vertical) with each phase of the circuit.

Fig. 4 is a view showing how, by means of a suitable connection, the three electrodes may be star connected to form a single are above the bath.

.abovethe massto'befmeltedfl I beginb'ecause 8 run-Neon 5, 6, 7 and8 are views showing the invention applied to'atwo phase circuit.

'iReferrmg to the fi'gu res in particular, Fig.

1' showsjan-electricfurnace A- provided with three electrodes 'B', each connected to one phase of a three phasecircuit.

lindicate's" the fui'nacebottom, the mass of material'to be meltedg (lithe s i d'e wallsfof the furnaceiar'e located three ad- "diti onal electrofdes j which are positioned in; suchunanner to have'their axe t a of he ec rodesC-B+; I A

good disposition of .the electrode is illustrated by the figures, in which the electrodes B "are' located at the vertex of aitriang'h, the electrodes E forming an? angle of 7 120. I 'Ihe latter are connected to theneutral 'wire'o f thejcircuit The initial stepof the operation. is performed by Q advancing the electrodes sojth'at an arc maybe procluce'dpbetweemea'ch'jof thern and ,one of the des "B' ,the arcs being :thus formed The inelti operation will of the heat developed by the arcs, that is for reverberation, until, by means of any suitable device, the two sets of electrodes are moved apart, leaving the arc to be formed directly between the electrodes B and the mass D- as it is shown in Fig. 2.

Fig. 3 shows the invention as applied to the electrodes connected in pair. each pair being connected to a phase of the three phase circuit. that it is possible to obtain a heatcontrol between very wide limits, because it is possible to cut out, and to regulate, by increasing or decreasing the power, any of In this case it is evident the three pair of electrodes and consequently any of the three arcs, leaving in operation one or two electrodes.

Fig. 4 is a view showing an arrangement similar to that of Fig. 1. the only difference residing in the fact that in this instance the vertical electrodes are adapted to be displaced so that they may be cut out of the circuit. the are being maintained between the melting mass and the side electrodes E-.

Figs. 5, 6, 7 and 8 show a certain number of arrangements similar to those described above, the supplying circuit being a two phase circuit.

I claim as my invention 1. In an electric furnace for melting metal, two sets of electrodes, the separate mtllic '5 el ov the bath er thee-one ,stflolfnlectrodes 1.111151 thcqmtal carried by the body .of the heroftheelti odgq each .se correspondsfiidelectrodes bein filiiced that the. aims of theelectif01 (if-one set-cross the mics 6f the electrodes oftheothrset, and one 'Stnf- "lotrodes being moiizthlerespectivelj :tb thelifller Set.

3. Inch electric fiirnace for melting steel or rtitallic ,lloys; two sets of electrodes,

one .hfxirhidlri's' fifiejd relative to the other; re t rting circuihpzissing through the elecpass through of hoth .s'ts ,-tlie giro being initislly O ined eboveath mass-to be melted; stud varied to inake it stzirting circiiit 135.3%

thefii. ofelectrodes and BEST AVAILABLE COP:

the melting mass when the movable set of: electrodes is cut out or". the circuit, the arc heing then formed directly between the relatively fixed set of electrodes and the melting mass.

i. In an electric furnace for melting steel or metallic alloys; means for supplying and distributing multiphase electric current; comprising two'sets of electrodes, the electrodes of one set of which are respectively connected to each phase of the circuit, the electrodes of the other set being connected to theneutral through the ho'dyo'f the furnece the arc beinglinitially formed above and then directly' with the melting inass.

5. ln-an electric furnace for melting. steel or m tallic alloys; means for supplyingand distributing alternating electric current,

comprising-two sets of electrodes, one set of which is movable relative to the other and out of the circuit, the electrodes of the set rcmainingiii the circuit being star-connected, the are being formed and main-.

tfiin'ed zih'ov the molten bath. 7

In testimony whereof I have hereunto sighed my name in the presence of two witnesses.

LEON E TAGLIAFERRI.

Witnesses T, G. BRUZZUSE, Dom'sxrco' Joti'. 

